Functions of the digital input and digital outputs

Functions of the digital input

Active alarms transmitted by the ETU can be acknowledged via the digital input.

Functions of the digital outputs

With the powerconfig software application, it is possible to selectively assign signals transmitted by the connected ETU to the four digital outputs of the EFB300. powerconfig can be accessed via the TD500 test device or by means of the COM800 or COM100 breaker data server through the interface to the communication system.

The following signals (dependent on the ETU) can be assigned:

  • All reasons for ETU tripping (L, S, I, N and G) plus
    Phase loss

  • Overload alarms AL 1 and AL 2

  • Pre-trip alarm for overload protection
    An alarm is output in advance of a trip event, allowing time for a load to be shut down before a maximum output or current limit is exceeded.

  • Load shedding/load pick up
    By means of the load shedding and load pick up signals, a load can be switched off or connected automatically depending on the capacity utilization of the 3VA molded case circuit breaker.

  • RCD trip

  • Energy pulse (with ETU 8-series only)
    An energy pulse (S0 signal pulse) contains information pertaining to the consumption of a specific quantity of energy. The data are transmitted by weighted pulses, i.e. a specific number of pulses are transferred to represent one kWh unit.
    Settings for the energy pulse, see table on next page.

Example of energy pulse:

Energy meter source:

Active energy kWh

Pulses per unit:



20 kWh

Pulse length:

30 ms

Output of 140 kWh:

Output of 35 pulses, each 30 ms in length

Overview of functions available with EFB300 external function box